XML 78 R67.htm IDEA: XBRL DOCUMENT
v3.24.3

Borrowings - Secured Financing (Details) - USD ($) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
May 31, 2024 | Aug. 31, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Aug. 31, 2024 | Dec. 31, 2023
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Total Issued |  |  |  | $ 1,536,000,000 |  | $ 1,147,000,000
Total loans and accrued interest amount securitized at inception |  |  |  | 1,678,289,000 |  | $ 1,292,507,000
2023-A |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Total Issued |  |  | $ 579,000,000 |  |  |
Weighted Average Cost of Funds (as a percent) |  |  | 1.53% |  |  |
Weighted Average Life (in years) |  |  | 5 years 21 days |  |  |
2023-C |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Total Issued |  | $ 568,000,000 |  |  |  |
Weighted Average Cost of Funds (as a percent) |  | 1.69% |  |  |  |
Weighted Average Life (in years) |  | 4 years 11 months 4 days |  |  |  |
2024-C |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Total Issued | $ 668,000,000 |  |  |  |  |
Weighted Average Cost of Funds (as a percent) | 1.19% |  |  |  |  |
Weighted Average Life (in years) | 5 years 4 months 9 days |  |  |  |  |
Principal amount of collateral |  |  |  | 656,000,000 |  |
Capitalized interest |  |  |  | 60,000,000 |  |
2024-E |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Total Issued |  |  |  |  | $ 868,000,000 |
Weighted Average Cost of Funds (as a percent) | 1.42% |  |  |  |  |
Weighted Average Life (in years) | 5 years 2 months 1 day |  |  |  |  |
Principal amount of collateral |  |  |  | 855,000,000 |  |
Capitalized interest |  |  |  | 78,000,000 |  |
Private Education Loans Securitized In 2023 |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Loans |  |  |  | 1,110,000,000 |  |
Principal amount of collateral |  |  |  | 1,020,000,000.00 |  |
Capitalized interest |  |  |  | 85,000,000 |  |
Private Education Loans Securitized In 2024 |  |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |  |
Loans |  |  |  | 1,650,000,000 |  |
Principal amount of collateral |  |  |  | 1,510,000,000 |  |
Capitalized interest |  |  |  | $ 138,000,000 |  |

X
- Definition Debt Instrument, Weighted Average Life + References No definition available. + Details
Name: | slm_DebtInstrumentWeightedAverageLife
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loan Amount Securitized + References No definition available. + Details
Name: | slm_LoanAmountSecuritized
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loans Pledged As Collateral, Capitalized Interest + References No definition available. + Details
Name: | slm_LoansPledgedAsCollateralCapitalizedInterest
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loans Pledged As Collateral, Principal Amount + References No definition available. + Details
Name: | slm_LoansPledgedAsCollateralPrincipalAmount
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-13 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 29 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-29 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (1) -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (2) -Publisher SEC Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-K (SK) -Number 229 -Section 1404 -Paragraph a -Publisher SEC Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SecuritiesFinancingTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_SMBPrivateEducationLoanTrust2023AMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_SMBPrivateEducationLoanTrust2023CMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_SMBPrivateEducationLoanTrust2024CMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_SMBPrivateEducationLoanTrust2024EMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_PrivateEducationLoansSecuritizedIn2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_PrivateEducationLoansSecuritizedIn2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |